It is not the direct battering that breaks the dyke, but overtopping, when the flow of water sweeps away the inland face, so swash length is a vital thing to accommodate, and to do that you must make an estimate of the highest possible tides.
Source: wiktionary
The first process occurs when swash mixes air and sand, trapping air bubbles just below the beach surface.
Source: wiktionary
The swash is made up of the remnants of a breaking wave.
Source: wiktionary
According to what you say about the shells, there ought to be a thousand flamingos feeding in this very swash at this instant.
Source: wiktionary
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